Using Fast Simulations to Optimize Hybrid Tracking Concept for ATHENA at EIC

The upcoming Electron-Ion Collider (EIC) presents an opportunity to develop a new generation of detectors best suited to the science needs of the new facility. One of the tracking detector concepts explored by the ATHENA collaboration is a hybrid tracking detector which uses Silicon trackers as well as micro-pattern gas detectors. Before the tracking subsystems are integrated into a fully simulated detector using detailed simulations, fast simulations using a Geant4-based Fun4All framework are used to aid in the design of the tracking detectors. These simulations are used to optimize the tracking subsystems to better meet the requirements to achieve the physics goals of the EIC. Presented here are a selection of studies used to optimize the design of the hybrid tracker concept.